| 摘要 |
PROBLEM TO BE SOLVED: To emphasize and output sound from a sound source present in an object region. SOLUTION: A phase difference correction part 20 extracts discrete values of first and second observation signals generated by first and second microphone modules 10 and 11. A sound source position determination part 21 calculates first and second observation power values from the discrete values of the first and second observation signals. When at least one of the first and second observation values is not larger than a threshold value, it is determined that the sound source is not present in the object region and, when both the first and second observation power values are larger than the threshold value, it is determined that the sound source is present in the object region. An output calculation part 22 outputs a synthesized signal obtained by superposing the first and second observation signals after correcting only the phase difference in the case where the sound source is present in the object region when the sound source is not present in the object region, and outputs the synthesized signal by amplifying it with an amplification factor larger than that in the case where the sound source is not present in the object region when the sound source is present in the object region. COPYRIGHT: (C)2009,JPO&INPIT
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